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Online retailers continue to spend the most money on paid search, but that’s because it’s the most effective way to attract new customers, a Forrester Research and Shop.org report says. And it was more effective in 2013 than the year before, retailers say.

Online retailers continue to spend the most money on paid search, but that’s because it’s the most effective way to attract new customers, a Forrester Research and Shop.org report says. And it was more effective in 2013 than the year before, retailers say.